JPH023912Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sharpening pencil that can be centered using the index finger.

In order to eliminate the trouble of changing the tool each time,
The structure of a sharp pencil that can be centered by notching the tip of the lead is described in Japanese Patent Application Laid-Open No. 53-145734.
It is stated in the No. However, the tip-knot type sharp pencil has a slider with a lead-preventing member provided at the tip of the barrel, and a chuck set that strongly resists the lead sliding back but easily allows the lead to be dragged out. When the tip of the lead is pressed, both of them are moved back together using the lead as an intermediary, and when the pressure is released and each returns to the previous state, one of them must be delayed and returned. Therefore, the structure had the disadvantage of being quite complex.

The present inventor proposed that if the slider with the lead detent member could be operated back and forth directly with the index finger, the lead bited by the chuck set would remain in the same state.
Although the slider slides back at the lead gripping point of the lead detent member, the next time the slider returns, the lead can be pulled out of the chuck set by the lead gripping force of the detent member, and centering is possible. There is no need for simultaneous retraction of the slider and chuck set using the above-mentioned lead as an intermediary, and there is no need to delay either of them when returning, and furthermore, there is no need for operational errors that may cause breakage of the lead during centering. I found out that I don't have to give it.

The purpose of the present invention is to provide a sharpening pencil that can be centered with the index finger. .

Reference numeral 1 denotes an operating member consisting of a mounting leg portion 2 and a fingertip operating portion 3, and the operating member (1) is integrally connected to a slider 4. There are two embodiments depending on where on the slider 4 the mounting leg portion 2 is fixed. The first is the case where the slider core tube part 5 is stuck to the outside of the shaft tube 7 as shown in FIG. 1, and the second is when it is hidden inside the shaft tube 7 as shown in FIG. This is a case where the slider is fixed to the rear cylinder portion 6. In the former case, by providing an appropriate distance between the operating member 1 and the barrel end portion 7a, it is possible to directly move the slider 4 back and forth by fingertip operation. By forming a groove 9 along the longitudinal direction on one side and forming a protrusion 8 that fits into the groove 9 on the other side, it is possible to move back and forth in a constant longitudinal direction. In the latter case, the protrusion 8 is replaced by a mounting leg portion 2, and the groove 9 is replaced by a through hole 10 formed in the shaft tube 7 so that the mounting leg portion 2 can be inserted through the shaft tube 7. The core detent member 12 is installed inside the slider rear cylinder portion 6, and the slider spring 1
3 to always urge the slider 4 forward is the same as in the conventional example described above. Since the slider 4 is always urged forward and can be positioned at the front position, the normal position of the fingertip operation part 3 is also located at the front position corresponding to the starting end of the groove 9 or the through hole 10. .

The chuck set 14 includes a chuck actuating body 14a having an inclined surface exhibiting a wedge action, a trochanter 14b, a chuck body 14c forming a seat for the trochanter 14b,
An example of a ball chuck is shown which is composed of a chuck spring 14d stretched between the chuck actuating body 14a and the chuck body 14c, but this chuck spring 14d is sufficient to provide a clamping force to withstand the writing pressure applied to the lead. Moreover, even with the core holding force by the core detent member 12, when the core moves forward, it is made into a compressible weak spring force. The chuck set 14 urges the chuck actuating body 14a rearwardly by an internal spring 15 to assume a normal position. The figure also shows part of the mechanism for opening and closing the chuck using the rear end notch and side notch, but this point is not directly related to the gist of the present invention, so we will not discuss this point in detail. Omitted. However, depending on how the mechanism is configured, the internal spring 15 can be omitted.

As described above, in the present invention, the slider rear tube portion 6 is attached to the rear end of the slider core tube portion 5 in the shaft tube 7.
A slider 4 with a core detent member 12 which is configured by fixing the core and is biased forward by a slider spring 13, and a chuck set 14 which can drag the core when the member 12 moves forward with the core holding force of the core detent member 12. In the attached sharp pencil, the mounting leg portion 2 of the operating member 1 is fixed to the slider 4 so that the fingertip operating portion 3 of the operating member 1 is exposed outside the barrel 7, so that the user can While gripping the tube 7, use your index finger to pull the fingertip operating portion 3 of the operating member 1 toward you against the force of the slider spring 13 (see Figure 2), then release the fingertip (see Figure 3). By performing this operation, centering can be performed without fear of core breakage.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Figs. 2 and 3 are half-cut sectional views showing the order of operation, and Fig. 4 is a sectional view showing the second embodiment of the invention. It is. 1... Operating member, 2... Mounting leg part, 3... Fingertip operating part, 4... Slider, 7... Shaft cylinder, 1
2... core detent member, 13... spring for slider, 14... chuck set.

Claims (1)

[Scope of utility model registration request] A slider 4 with a core detent member 12 which is constructed by fixing a slider rear cylinder portion 6 to the rear end of a slider core tube portion 5 in a shaft cylinder 7 and is biased forward by a slider spring 13, and a core detent member. In a sharp pencil equipped with a chuck set 14 that can pull out the lead when the member 12 moves forward with a lead holding force of 12, the operating member 1 is set so that the fingertip operating portion 3 of the operating member 1 is exposed outside the barrel 7. A sharpening pencil in which the mounting leg part 2 is fixed to the slider 4.